Porous Polymer Getter Systems for OLED Optical Stability
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Solution Overview
Problem
Existing getter systems face challenges such as insufficient cohesion of powder materials, structural modifications during gas sorption, and changes in optical properties, particularly in applications like OLEDs, where transparency and consistent performance are required.
Innovation Solution
A getter system comprising a polymeric means permeable to gases with a powder of porous material distributed within, where the active phase for gas sorption is located inside the pores of the material, maintaining physical properties invariant and allowing for reversible or non-reversible reactions, and potentially including catalysts for enhanced reaction support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If getter material is dispersed in a polymer matrix, then mechanical stability is improved, but gas sorption speed is reduced due to matrix hindrance
Solution Approach 1:
The patent employs a porous polymer matrix with controlled porosity that allows gas molecules to access the getter particles efficiently. The porous structure provides channels for gas diffusion while maintaining mechanical integrity, thus resolving the contradiction between mechanical stability and gas sorption speed.
Solution Approach 2:
The invention creates a composite system combining getter particles (such as alkaline-earth metal oxides) with a specifically designed porous polymer matrix. This composite structure leverages the mechanical properties of the polymer while preserving the high sorption capacity and kinetics of the getter material through optimized pore architecture.
2Quantity of substance
If desiccant material is used after moisture sorption, then gas sorption capacity is improved, but cohesion is lost and powder cannot form compact bodies
Solution Approach 1:
The getter material is pre-encapsulated within the porous polymer matrix before moisture sorption occurs. This preliminary encapsulation action prevents the loss of cohesion that would otherwise occur after the desiccant absorbs moisture, as the polymer matrix maintains the structural integrity of the compact body throughout the sorption process.
3Illumination intensity
If getter particles are dispersed in transparent matrix, then optical transparency is improved, but optical properties change during device life due to moisture sorption
Solution Approach 1:
The porous polymer matrix is designed with pore sizes and distributions that allow moisture to be sorbed by the getter particles without causing significant swelling or structural changes visible at the optical level. The matrix porosity accommodates the volume changes of getter particles during sorption, maintaining optical transparency and property stability throughout the device lifecycle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures consistent gas sorption performance without altering the matrix's interactions, maintains transparency, and supports catalyzed reactions, addressing the limitations of prior art in industrial applications like OLEDs by maintaining optical stability throughout the device's life.
Implementation Method 1
Getter materials and systems are widely used in industry in all applications where it is necessary to maintain a vacuum or to control the composition of a gaseous atmosphere through the sorption of traces of undesired gases
Implementation Method 2
a polymeric means permeable to the gases to be sorbed
Data Source
AI summary
Getter systems are provided having a phase being active in the sorption of gas inserted in the pores of a porous material. The porous material is, in turn, dispersed in a polymeric means that is permeable to the gas to be sorbed.